2, according to the shape of the window can be divided into: flat doors and windows, sliding windows, folding windows, turn windows, turn windows are divided into the top hung window, under the hung window, in the hung window, vertical window, shutters.

3, according to the function of the window can be divided into: fire windows, sound insulation windows, insulation windows and so on.

4, according to the location of the window: the window is divided into side windows (set on the inner and outer walls) and skylights.